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Home > Products > Integrated Circuits (ICs) > Linear > Audio Amplifiers

STMicroelectronics FDA903S-6DY

Name: FDA903S-6DY
Brand: STMicroelectronics
SKU: FDA903S-6DY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FDA903S-6DY

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 32-VFQFN Exposed Pad

Datasheet:: FDA903S-6DY.pdf

Description:: 1 X 10 W CLASS D DIGITAL INPUT A

Quantity:: RFQ Add To RFQ list

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Inventory:200

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Product details

Overview

FDA903S-6DY from STMicroelectronics is a single-channel Class-D audio amplifier IC designed for automotive telematics and eCall systems. It integrates a 24-bit, 100 dB DAC, I²S/TDM digital input (up to 16 channels), selectable PWM switching frequencies (352.8–448 kHz), wide 3.3 V–18 V supply range, and real-time in-play diagnostics including load-current monitoring and Digital Admittance Meter (DAM).

For engineers reviewing the FDA903S-6DY datasheet, FDA903S-6DY pinout, FDA903S-6DY application, or FDA903S-6DY equivalent, key selection criteria include AEC-Q100 qualification, QFN32 wettable flanks package, 10 W @ 4 Ω / 14.4 V output capability, CISPR 25 Class V EMC compliance, and full I²C configurability for thermal, clipping, OCP, and open-load diagnostics.

Technical Context

The FDA903S employs feedback-before-LC filter architecture to reduce external passive component size and cost while maintaining audio fidelity. Its PLL derives internal clocks directly from the I²S/TDM bitstream, supporting sample rates from 8 kHz to 96 kHz across I²S and TDM formats.

Digital core functions include configurable input amplitude limiting, startup and runtime diagnostics (4 thermal warnings, DC offset detection, DAM), and dual CD/Diag pins for hardware-level fault signaling. All diagnostics operate during active audio playback, enabling ASIL-A–capable warning-tone and AVAS implementations.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	10 W @ 4 Ω, 14.4 V, 1 kHz, THD = 1% - enables compact speaker drive in space-constrained telematics modules
DAC Resolution	24-bit, 100 dB SNR - delivers high-fidelity audio with low quantization noise for voice-critical eCall applications
Digital Input	I²S/TDM up to 16 channels, 8–96 kHz sampling - supports multi-source audio routing and OEM-defined channel mapping
PWM Frequency	Selectable via I²C: 352.8 / 384 / 411.6 / 448 kHz - allows EMI optimization around sensitive RF bands (e.g., GNSS, LTE)
Supply Range	3.3 V–18 V - sustains operation during automotive cranking (down to 3.3 V) and battery transients
Diagnostic Coverage	In-play thermal warning, clipping detection, OCP, open-load, DC offset, DAM - provides real-time speaker health monitoring without interrupting audio
EMC Compliance	CISPR 25 Class V (4th ed.) - meets stringent automotive radiated emissions requirements for front-end module integration

Pinout & Package

Package: QFN32 (5 mm × 5 mm × 1 mm, exposed pad down, wettable flanks, 3.5 mm × 3.5 mm thermal pad). Optimized for automated optical inspection (AOI) and high-reliability solder joint formation in automotive PCB assembly.

Pin/Terminal	Circuit Role	Design Meaning
OUT1+, OUT1−	Half-bridge power outputs	Drive speaker load differentially; support 4 Ω and 8 Ω configurations with integrated MOSFETs
VCC1+, VCC1−, GND1+, GND1−	Channel 1 power supply rails and grounds	Separate high-side/low-side power paths minimize crosstalk and improve thermal distribution
I2Cclk, I2Cdata	I²C interface signals	Open-drain configuration supports multi-drop bus topology with standard 100/400 kHz timing
CD/Diag1, CD/Diag2	Dedicated diagnostic output pins	Configurable as clipping detector or thermal/OCP warning; enable hardware-triggered MCU response without polling
Enable1, Enable2	Power-up control inputs	Independent enable logic allows staged system boot and fail-safe shutdown sequencing
HWMute	Hardware mute input	Asynchronous, level-sensitive mute bypasses I²C latency for immediate audio suppression during safety events
I2SdataIN, I2SdataOUT, I2Sclk, I2Sws	Digital audio interface	Supports master/slave I²S and TDM modes; data-out enables daisy-chaining or loopback verification

Key Features

Feature	Design Value
Feedback-before-LC architecture	Reduces required LC filter size by >40%, enabling smaller BOM and lower system cost in telematics head units
In-play diagnostic engine	Real-time load-current monitoring and DAM provide speaker impedance tracking during audio playback - critical for ASIL-A warning-tone validation
Configurable PWM frequency	Four discrete switching frequencies allow EMI tuning to avoid interference with GNSS (1.575 GHz), LTE Band 7 (2.6 GHz), or other RF receivers
AEC-Q100 Grade 0 qualification	Rated for −40 °C to +150 °C junction temperature - ensures reliability in under-hood or dashboard-mounted eCall modules
Wettable flanks QFN32	Enables AOI-compatible solder joint inspection - mandatory for zero-defect automotive production traceability

Applications

eCall Voice Alert System

Telematics Control Unit (TCU)

Use Scenario: Emergency voice broadcast triggered by airbag deployment or crash sensor activation.

IC Role / Device Role / Timing Role: Single-channel Class-D amplifier driving cabin speaker with guaranteed start-up at 3.3 V cranking voltage.

Use Value: AEC-Q100 Grade 0 rating and in-play diagnostics ensure functional safety compliance for ISO 26262 ASIL-A warning-tone generation.

Use Scenario: Integrated audio subsystem handling navigation prompts, Bluetooth call audio, and OTA update tones.

IC Role / Device Role / Timing Role: Digital-input amplifier receiving I²S from SoC, with TDM support for multi-source mixing.

Use Value: 16-channel TDM capability and I²C-configurable limiter enable flexible audio routing without external DSP.

Acoustic Vehicle Alerting System (AVAS)

Automotive Infotainment Gateway

Use Scenario: Low-speed pedestrian alert tone generation mandated by UN Regulation No. 138.

IC Role / Device Role / Timing Role: High-SNR audio driver with DAM-based speaker health monitoring to prevent silent failure.

Use Value: 100 dB DAC resolution and A-weighted 38 µV noise floor meet EU acoustic purity requirements for frequency-specific tone profiles.

Use Scenario: Central audio hub aggregating inputs from ADAS camera, rear-seat entertainment, and cloud services.

IC Role / Device Role / Timing Role: Diagnostics-capable amplifier with dual CD/Diag pins for synchronized platform-level fault reporting.

Use Value: Hardware-level diagnostic outputs eliminate software polling latency, improving system-level fault response time by >10×.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Class-D automotive audio amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TAS5412AQPWRQ1	2-channel, 12 W/channel @ 4 Ω, fixed 384 kHz PWM, no DAM or in-play current monitoring	Lacks real-time load-current sensing and digital admittance meter - requires external ADC for speaker health checks	Choose when multi-channel output is prioritized over diagnostic depth and ASIL-A support is not required
MAX98740ATJ+T	Single-channel, 15 W @ 4 Ω, 100 dB SNR, but only supports I²S (no TDM), no CISPR 25 Class V certification	Missing TDM scalability and automotive-grade EMC validation - unsuitable for OEM telematics platforms	Choose for non-automotive industrial audio where TDM and Class V compliance are unnecessary

Compared with TAS5412AQPWRQ1 and MAX98740ATJ+T, the FDA903S-6DY uniquely combines AEC-Q100 Grade 0, CISPR 25 Class V, in-play DAM, and 16-channel TDM - making it the only option qualified for safety-critical, multi-source automotive voice systems requiring zero-latency diagnostics.

Availability

FDA903S-6DY is available at Aetrix Electronics and suitable for automotive telematics, eCall emergency systems, and acoustic vehicle alerting systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for FDA903S-6DY includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with broad manufacturing and quality infrastructure.

The FDA903S belongs to ST's automotive Class-D amplifier product line, engineered specifically for safety-critical voice applications in telematics and eCall systems where diagnostic integrity, cranking resilience, and EMC robustness are mandatory.

FAQ

What is the minimum supply voltage for FDA903S-6DY during cold-cranking conditions?

The FDA903S-6DY operates down to 3.3 V, enabling reliable startup and audio playback during automotive cold-cranking events where battery voltage dips below 6 V. This is verified per AEC-Q100 transient test profiles and confirmed in DB4682 Rev 3 Section 3.

Does FDA903S-6DY support TDM format with more than 8 channels?

Yes - the FDA903S-6DY supports up to 16-channel TDM on its I²S/TDM interface, as documented in DB4682 Rev 3 Section 3 and validated in Figure 3 application diagram. Channel count is configured via I²C register settings, not hardware strapping.

How does the Digital Admittance Meter (DAM) function in FDA903S-6DY?

The DAM performs real-time speaker impedance characterization using internal current/voltage sensing and digital signal processing. It reports admittance data via I²C and triggers CD/Diag pin alerts for abnormal load conditions - all while audio plays continuously, as specified in DB4682 Rev 3 Section 3.

Can FDA903S-6DY be used without an external LC filter?

No - the FDA903S-6DY requires an external LC filter between OUT1+/OUT1− and the speaker, as its feedback loop is placed before the filter. The feedback-before-LC architecture reduces filter component size but does not eliminate the need for passive filtering, per DB4682 Rev 3 Figure 3 and Section 3.

FDA903S-6DY Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 32-VFQFN Exposed Pad

Packaging:: Tray

Product Status:: Active

Type:: Class D

Output Type:: 1-Channel (Mono) or 2-Channel (Stereo)

Max Output Power x Channels @ Load:: 10W x 1 @ 4Ohm; 5W x 2 @ 8Ohm

Voltage - Supply:: 3.3V ~ 18V

Features:: -

Mounting Type:: Surface Mount, Wettable Flank

Operating Temperature:: -

Grade:: Automotive

Qualification:: AEC-Q100

Supplier Device Package:: 32-QFN (5x5)

FDA903S-6DY FAQ

1.How can I place an order for FDA903S-6DY through Aetrix?

Please submit a Request for Quotation (RFQ) for FDA903S-6DY on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for FDA903S-6DY reliable?

The price and inventory of FDA903S-6DY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FDA903S-6DY is usually 5 days.

3.What payment methods are accepted for FDA903S-6DY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FDA903S-6DY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FDA903S-6DY?

FDA903S-6DY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FDA903S-6DY order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for FDA903S-6DY?

For technical support, including FDA903S-6DY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FDA903S-6DY requirements.

6.How does Aetrix verify that FDA903S-6DY is sourced from the original manufacturer or authorized distributors?

All FDA903S-6DY products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that FDA903S-6DY meets industry standards.

7.What is the process for return or replacement of FDA903S-6DY?

All FDA903S-6DY units undergo pre-shipment inspection (PSI). If there is an issue with FDA903S-6DY, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The FDA903S-6DY part is unused and in its original packaging.

Return procedure for FDA903S-6DY:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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